It is someone's last name, like Ford's being named after Henry Ford. See short excerpt below.

Suzuki wasn't always the Motor Corporation. In 1909, Michio Suzuki founded the Suzuki Loom Company in the small seacoast village of Hamamatsu, Japan. Business boomed as Suzuki built weaving looms for Japan's giant silk industry. Suzuki's only desire was to build better, more user-friendly looms. For the first 30 years of the company's existence, its focus was on the development and production of these exceptionally complex machines.

Despite the success of his looms, Suzuki realized his company had to diversify and he began to look at other products. Based on consumer demand, he decided that building a small car would be the most practical new venture. The project began in 1937, and within two years Suzuki had completed several compact prototype cars. These first Suzuki motor vehicles were powered by a then-innovative, liquid-cooled, four-stroke, four-cylinder engine. It featured a cast aluminum crankcase and gearbox and generated 13 horsepower from a displacement of less than 800cc.